#include <stdio.h>


int main()

{
    char c = 0;
    char d = 0;
    //行缓冲
    scanf(" %c",&c);
    while(getchar() != '\n');  //清理垃圾值
    scanf(" %c",&d);

    printf("c : %c  d : %c\n",c,d);
    return 0;
}